Charles e



-(No Model.)

0. E. CARPENTER. ELECTRIC BMBOSSING STAMP.

No. 477,627. Patented June 21, 1892.

WITNESSES: m VE/VTOI? ATTORNEYJ.

UNITED STATES PATE T OFFICE.

CHARLES E. CARPENTER, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO THE (JARPENTER-NEVENS ELECTRO HEATING COMPANY, OF SAME PLACE,

ELECTRIC sMBossmc-si AMP.

SPECIFICATION formingart of Letters Patent N0. $77,627, dated June 21, 18 9 2. Appliostlouflled June 21,1890. Serial No. 356,202. (No model.)

- To all whom it may concern.-

. Be it known that I, CHARLES E. CARPENTER, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Electric Embossing- Stamps; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the ac.- companying drawings, and to the letters of reference marked thereon, which form a part of this specification.

Thisi nvention relates to improvements in embossing -or' otherstamps, which are now commonly heated by the direct action thereon of fire or a gas-jet or other similar means for raising the temperature thereof to the desired degree suitable for embossing. The objec tions to these methods are the great wastage of heat, the inconvenience of handling a stamp when so heated, and the resultant heatmg ofthe bed and other parts of the press in proximity to the stamp.

e The prime object of this invention is to have the stamp electrically heated and so constructed as to withstand the pressure to which a stamp of this kind is subjected when in use.

Anotherobject is to prevent, as far as possible, the wastage of heat by conduction from the stamp to the bed of the machine, against which it bears.

These objects are attained by the devices.

illustrated in the accompanying drawings, in Whi0h I, Y V

Figure 1 represents a vertical longitudinal BGCtlOllithlOllgh an embossing-stamp embodying myinvention, and-Fig. 2 a top plan view thereof with parts broken away to more clearly disclose the internal structure. s v Similar letters of reference indicate the same parts throughout both figures of the drawings.

5 7 Referring by letterto the accompanying 5c the electrical insulation. ,D' and a layer or card I otaspestus-E, which lat-ter' not only insulates drawings, A represents the plate to be heated, and B the compressing-plate, between which intervene the electrical conductor or resistant of the reflexed type (indicated in Fig. 2) and the resistance electrically from the compress ing-plate,-bnt also serves to greatly impair the conduction of heat and tends to concentrate the seine upon the plate A.

Pressure between the plates A and B is obits surface, as may and still reduce the surface of contact'to the minimum, for obviously much less heat will be conducted, and hence wasted, with this form of structure than if the cones or points were not used. I may here state, however, that rigid corrugations or any other form of projections from the surface of the compressing-plate may be substituted for the cones without departing from the spirit of my invention, the cones, however, being preferred, because giving so little contact for the amount of support derived therefrom.

This apparatus is used as a plate, to which embossing-stamps used in book-binderies as well as shoe-stamps and similar utensils may be detachably secured, as represented by the plate I in Fig. 1, either by screws or in the manner now commonly used of intervening between the plate A of and the stamp I, with its engraved surface,

the embossing-plate a layer of paper or pasteboard, to the sur faces of which is applied glue, paste, or some other adhesive material. {if desired, however, 7 the stamp proper may constitute a permanent part of-the heating apparatus by dispensing with the heated plate .A and attaching the compressingepla'te by the screws F directly to the stamp I, with the heating element intervening therebetween. This latter construction may be found most desirable in binderies where a single stamp is used contlnuonsly or for any considerable amount of too work; but where the stamp is changed at intervals of greater or less length the first-described construction will be found mostadvantageous.

An embossing-stamp constructed as herein described possesses numerous advantages, chief among which is its capability of withstanding'the, heavy pressure to which such a utensil is subjected without injury thereto and without impairing the usefulness thereof, combining economy and convenience as well as utility in the maximum degree.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

1. In an electric embossing-stamp,thecombinatiou, with the heated plate, the compressing-plate secured thereto underpressure, and projections upon the outer face of said com- 20 pressing-plate, of an electrical conductor or resistance interposed between said plates and an insulationinterpoSed betweeu said resistance and each of said plates, substantially as described.

2. In an electric embossing-stamp, the combination, with the heated plate, the stamp detachably secured thereto, the compressing:

plate secured to said heated plate underpre'ss hrs, and projections on the outer face of said compressing-plate, of an electrical conductor or resistance confined between said heated and compressing plates and an insulation interposed between said resistance and each of said plates, substantially as described.

In testimony whereof I affix my signature in 3 5 presence of 

